pascal triangle c++

pascal_tri.cpp

#include <iostream>
using namespace std;

int a, b;

int main() {
    cout << "A: ";
    cin >> a;
    cout << 1 << " " << endl;
    for(int i = 0; i <= a; i++) {
        b = 1;
        for(int j = 0; j <= i; j++) {
            cout << b << " ";
            b = b * (i - j) / (j + 1);
        }
        cout << endl;
    }
    return 0;
}